| 摘要: |
| 主要研究了激光-TIG电弧复合焊复合模式、热源间距(Dla)和激光脉冲参数对镁合金T形件成形的影响.研究发现TIG-激光的复合模式更有利于T形件的成形.在TIG-激光复合模式下,Dla随着焊接电流的提高而增加时会得到更大的焊接熔深,焊接电流为100 A,Dla为3 mm时可以得到良好的镁合金T形结构件焊缝成形.激光脉宽过小或过大都会对T形结构件焊缝根部的成形产生不良影响,脉冲较小时T形件立板与上板结合处的熔池金属极易产生过烧,从而导致焊接表面塌陷严重,甚至烧穿;脉冲过大时则造成立板与上板结合处熔化不足而产生不熔合现象. |
| 关键词: 激光-TIG复合焊接 T形件 镁合金 |
| DOI： |
| 分类号: |
| 基金项目: |
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| T-joint of magnesium alloy welded by laser-TIG hybrid welding |
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YUAN Shengtao1, LIANG Pengfei1, CHENG Xin1, LIU Liming2
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1.Suzhou Nuclear Power Research Institute, Suzhou 215000 China;2.Technology & School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
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| Abstract: |
| This paper presents the influence of laser-TIG welding mode, distance between the laser and arc(DLA), laser pulse parameter on the formation of magnesium alloy T-joint. Results show that the TIG-laser hybrid mode is benefit for the weld formation. In TIG-laser mode, greater welding penetration depth can be obtained when the Dla increases with the increase of arc current. Good T-joint formation was gained at 100 A arc current and 3 mm Dla. An extremely large or small laser pulse width deteriorates the weld root formation. When the laser pulse width is extremely small, the junction of the wall panel and strengthening rib will be over-heated, resulting in the surface collapse or even burnt-through. When the laser pulse width is too large, the wall panel and the strengthening rib cannot melt and effectively joined together. |
| Key words: laser-TIG welding T-joint magnesium alloy |
